RU233972U1 - Mechanism of longitudinal movement of the table of cylindrical grinding machines - Google Patents

Abstract

The utility model relates to mechanical engineering and can be used in the designs of cylindrical grinding machines. The mechanism for longitudinal movement of the table of a cylindrical grinding machine contains a servomotor with a built-in position sensor, installed with the possibility of transmitting, by means of an intermediate shaft through a worm gear reducer, a rotary motion converted into a translational motion of the said table by means of a screw of a ball screw pair, made with the possibility of fastening to the table through a bracket by means of nuts. The mechanism contains two radial-thrust bearings installed with the location of their axes at an angle of 90° to each other. The worm gear reducer is installed with an angular clearance of no more than 5 minutes, ensured by adjusting the axial position of the said bearings. Creation of a modular design of the mechanism for longitudinal movement of the table is provided, which allows it to be assembled without frame parts. 1 Fig.

Description

The utility model relates to the field of mechanical engineering and can be used for the manufacture of electromechanical drives of modular design used in cylindrical grinding machines, including machines with numerical control (CNC) and other systems where precise motion control is required.

The closest in technical essence to the claimed utility model is a mechanism for driving the movement of the table of a reciprocating movement mechanism for metal-cutting machines [RU Patent 72168, 2007], comprising an electric motor, a central shaft connected to a manual movement drive, electromagnetic clutches and gears, characterized in that a first helical gear and a rigid clutch connecting it to a worm gear of the central shaft, consisting of first and second worm pairs, are mounted on the central shaft coaxially with said first worm pair, said second worm pair is mounted on the worm of which a second helical gear is mounted, coupled with said first helical gear mounted on the shaft of the electric motor, which allows the worm wheels of said worm pairs, mounted on the central shaft on rolling bearings, to rotate in opposite directions, to transmit rotation from the said worm gear pairs to the central shaft, the mechanism contains electromagnetic clutches, one half of which is secured to the said worm gear wheels, and the other half is secured to the keys of the central shaft.

A disadvantage of this utility model may be the complexity of the design, which increases the likelihood of breakdowns and increases the cost of production and repair. The presence of a large number of components, such as gears, couplings and bearings, can also complicate maintenance and diagnostics of faults. There is no possibility to assemble the movement unit without the need for frame parts.

The technical result of the utility model is an increase in the machine's precision resource and an increase in the precision of parts processing during cylindrical grinding, achieved thanks to the modular design of the movement unit, which allows it to be assembled without frame parts, reduces assembly time by 1.5 times, reduces costs for mechanical processing by 30%, eliminates the need for specialized gear-cutting equipment and reduces the volume of material used for longitudinal movement by 2 times.

This technical result is achieved by the fact that the longitudinal movement drive design of the machine, consisting of a servomotor, worm gear, intermediate shaft, ball screw pair, is made modular using standard components. The design allows for easy adaptation and reconfiguration of the equipment for various tasks, ensures ease of maintenance and repair, and also makes it possible to replace individual components without completely disassembling the machine, which increases production efficiency and reduces maintenance costs.

The mechanism works as follows.

The servomotor 1, equipped with a built-in position sensor, transmits rotary motion via the worm gear reducer 1 by means of the intermediate shaft 2, which is converted into translational motion of the table by means of the screw of the ball screw pair (BSP) 3, fixed to the table of the machine 10 via the bracket 5 (Fig. 1). When the worm rotates, its thread engages with the teeth of the worm wheel and makes it rotate. As a result, the torque and angular velocity are converted, allowing the use of a servomotor with a small torque to control a heavy table of the machine. The connection of the shaft with the motor and the reducer is carried out using a keyed connection. The fastening of the nut of the ball screw pair 4 to the table of the machine 10 is carried out through the bracket 5 using nuts. The reducer is fixed to the machine bed using an adapter 6 and a bearing support 7; the rotary motion of the engine is converted into the translational motion of the table 10. The ball screw 3 is mounted in the bearing support 7 on a duplex pair of radial-thrust bearings 8; the required tension of the bearing pair is provided by pressing with a split nut 9. To eliminate the axial clearance between the screw and the nut and to obtain the required accuracy parameters for this longitudinal movement, a precision ball screw with a preliminary tension of the nut 4 is used. To create tension when using a screw with a semicircular thread profile, two nuts are installed, which are then shifted relative to each other along the axis. This relative shift can be achieved by placing gaskets between the nuts or by rotating them relative to each other. The worm gear 1 with an angular clearance of no more than 5 minutes is provided by adjusting the axial position of the bearings. Two radial thrust bearings are mounted on the shaft in an X-shape so that their axes are positioned at an angle of 90 degrees to each other. This evenly distributes the load between the bearings and prevents involuntary axial displacement of the machine table.

The proposed modular design of the table movement of the metal-cutting machine mechanism allows assembling the movement unit without the need for frame parts. The minimum number of parts involved in the transmission of linear motion has reduced the assembly time of the unit by 1.5 times and reduced the costs of mechanical processing of its production by 30%. The use of a worm gear in this design allows for high accuracy and smoothness of movement, which is important for CNC machines. They also have a low noise and vibration level, which ensures comfortable work for the operator. The need for specialized gear-cutting equipment has also disappeared, which further increases the efficiency of the process. The design allows you to adjust the tension of a pair of radial-thrust bearings, which can be useful when setting up the machine for specific tasks.

As a result, this design contributes to the increase of the machine's precision resource and improves the quality of parts processing during grinding, reduces the volume of material used for the production of longitudinal movement due to the use of radial thrust bearings to prevent axial displacement and ensure high precision due to tension and a special gearbox.

Claims (1)

A longitudinal movement mechanism for a cylindrical grinding machine table, comprising a servomotor with a built-in position sensor, installed with the possibility of transmitting, by means of an intermediate shaft through a worm gear reducer, rotary motion, converted into translational motion of the cylindrical grinding machine table by means of a screw of a ball screw pair, made with the possibility of fastening to the cylindrical grinding machine table through a bracket by means of nuts, characterized in that it is equipped with two radial-thrust bearings installed with their axes arranged at an angle of 90° to each other, wherein the worm gear reducer is installed with an angular clearance of no more than 5 minutes, provided by adjusting the axial position of said bearings.